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  1. #1

    Default Rough Idling and Heavy Exhaust Smell??

    I've got a 1986 Silverado (gas) that has started idling rough. It starts up fine (a little rough until given strong gas), but after it warms up and is in gear, I can feel it idling rough. Also, I've noticed that it seems to be putting off a heavier exhaust smell now. It doesn't generally stall, just idles rough. When not idling, it runs like it should.

    I assume it just needs a overall tune up (plugs, wires, etc), but I'm just trying to see if there's anything else that it could be too. Many thanks in advance!

  2. #2
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    Welcome to the GM truck club. By "heavy exhaust smell" do you mean "fuel rich smell" like unburned fuel in the exhaust? You are probably on the right track with a good tune up. Be sure & check the compression when you have the plugs out. Also be sure & check the air filter & the PCV valve when you do your tune, & take a good look inside the distributor cap. If there is any carbon tracking or corrosion on the terminals be sure & replace it & the rotor. They are cheap insurance compared to wasted time chasing an engine miss.

    '86 had a mix of TBIs' & carbs. What does yours have.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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